/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2022/2/15 13:54
 */
public class Test {
    public static void main(String[] args) {
        System.out.println(1-0.1==0.9);
        System.out.println(1-0.9==0.1);
        System.out.println(1-0.9);
    
//        System.out.println(1 / 0);
//        System.out.println(0 / 0);
        System.out.println(1.0 / 0);
        System.out.println(0.0 / 0);
    }
}
